Validation of a digital image processing software package for the in vivo measurement of wear in cemented Charnley total hip arthroplasties

Kennard, Emma; Wilcox, Ruth K.; Hall, Richard M.

doi:10.1016/j.medengphy.2005.06.007

Cited by 1 publication

(2 citation statements)

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“…All radiographs were analyzed (SW) using software written inhouse on a graphic programming package (IDL; ITT Corp, Boulder, CO) [13]. The program used an algorithm similar to that used by Shaver et al [16] to determine the femoral head and wire marker positions.…”

Section: Methodsmentioning

confidence: 99%

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Long-term Radiographic Assessment of Cemented Polyethylene Acetabular Cups

Williams

Isaac

Porter

et al. 2008

Clinical Orthopaedics &Amp; Related Research

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In vitro studies demonstrating excessive wear in polyethylene cups sterilized using gamma irradiation and stored in air led to the abandonment of this sterilization technique. We evaluated the clinical wear performance of a metal femoral component on a polyethylene cup in a hip prosthesis from a selected subset of implants in a group of patients followed for at least 20 years and assessed the time dependency of variation in penetration rates. We measured penetration in 33 polyethylene cups in 25 patients who had a Charnley low-friction arthroplasty between 1982 and 1984. All patients had Charnley Ogee 1 cups implanted for more than 20 years and sterilized using the gamma irradiation in air technique. If degradation occurred over time in vivo, it was not reflected by an increased penetration rate with increasing time in vivo; even after 20 years of implantation, the degree of wear remained low. This suggests gamma irradiation affects wear on ultra-highmolecular-weight polyethylene by reducing wear secondary to the crosslinking, by increasing wear as shown through in vitro studies of heavily oxidized samples, or by oxidation resulting from prolonged shelf life. The effect of progressive oxidation in vivo does not appear to affect wear in vivo.

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Section: Methodsmentioning

confidence: 99%

“…Radiographic penetration measurements were carried out at the different time intervals using in-house software previously validated by Kennard et al [13] (Tables 2, 3). Penetration against time plots for each patient was analyzed.…”

Section: Methodsmentioning

confidence: 99%